I am so sorry to hear of this issue!

Could you please try the following, to verify the integrity of the game cache:

1. Load Steam
2. From the Library section, right-click on the game and select Properties from the menu
3. Select the Local files tab and click the Verify integrity of game cache... button
4. Steam will verify the game's files - this process may take several minutes
5. Once the process is completed, the Check Window will automatically exit

If you continue to have trouble please let me know!

Hi I found a solution to this. I had the same problem, playing on a windows 10 touch screen convertible laptop with auto-rotation enabled. When my laptop rotated physically, the screen resolution went low (so it could fit the game screen to the portrait orientation) but it became stuck that way when rotated in landscape orientation as well! Here is the fix:
In the windows registry locate the following keys:

Computer\HKEY_CURRENT_USER\SOFTWARE\GameHouse\Amber's Airline\Screenmanager Resolution Height_h2627697771
Computer\HKEY_CURRENT_USER\SOFTWARE\GameHouse\Amber's Airline\Screenmanager Resolution Width_h182942802
Computer\HKEY_CURRENT_USER\SOFTWARE\GameHouse\Amber's Airline\Screenmanager Is Fullscreen mode_h3981298716

Make sure to set it on decimal mode when changing the value's. Full screen should be a 1, then height should be 1080 and width should be 1920. This is just an example, you could try other resolutions or deleting the keys and see what the game set's it as on it's own. This fixed it for me!